Malicious PDF — malware analysis report

Static analysis result for SHA-256 b036d809b2766e95…

MALICIOUS

PDF

92.2 KB Created: 2021-04-07 11:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a57cbc8d24e8d46ad36983fb13fab2de SHA-1: 280fd92e2b0baea8e9a151f018a851273b459292 SHA-256: b036d809b2766e95c7092d350801278cf5614d0f24658df9876a91790e70b727
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=on+the+road+lyrics+baekhyun
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/getef-gebukopani.pdf
    • https://cdn-cms.f-static.net/uploads/4378410/normal_6049c6404b149.pdf
    • https://cdn.sqhk.co/zuzudumijamo/5IAQb0N/cosmopolitan_meaning_sociology.pdf
    • http://pitushok.fun/zasifivifigitulatapajadekrnn0.pdf
    • http://promooffer.site/sme_underground_mining_methods_handbookthr36.pdf
    • https://detudonerud.weebly.com/uploads/1/3/4/6/134660859/6059292.pdf
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fddaeade44df.pdf
    • https://static.s123-cdn-static.com/uploads/4483591/normal_6008703266114.pdf
    • http://plusstore.pro/gewuxevupedajopiz129wd.pdf
    • http://milanbeachs.space/bahubali_2_telugu_songs_dj2cxgp.pdf
    • http://se-mrush.com/practice_sat_math_questions_with_answersjbdhm.pdf
    • http://boomua.site/gukubewebawsz2cx.pdf
    • http://azakalaza3.xyz/76873059707rqhrg.pdf
    • http://kismykeitio.best/how_to_open_door_lock_on_beko_washing_machine832a3.pdf
    • https://cdn.sqhk.co/bitaxukezor/jdhjHgj/57173852548.pdf
    • http://mmeueue.space/nom_036_stpser7ep.pdf
    • http://idealslimitaly.site/drug_discovery_today_author_guidelinesf4sw3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b90f93d9-96df-44ac-96a0-1db2c64f017f/82632364312.pdf
    • https://uploads.strikinglycdn.com/files/cbcea1f0-ae7c-46c8-968d-72e2d2eb3efc/samsung_bd-j5100_region_free_code.pdf
    • https://uploads.strikinglycdn.com/files/87ba09fa-0375-49b5-8474-4959e4a5b7ee/bapufisizat.pdf
    • https://uploads.strikinglycdn.com/files/4855f9e9-2eda-447b-ac44-8970d46235c3/mozewawotibimote.pdf
    • https://uploads.strikinglycdn.com/files/66dc8a9f-ba0b-445c-923c-06cf706f06ba/best_victor_frankenstein_quotes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f150.bin
9f71fd378a4ce311f515b718243fe00c3d2e319dbca08ae07264bcad4735cea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 19660 bytes
font_01_sfnt_off00012bb9.bin
17ddd2c4e5f723c286b42a93d030132e6b5f880b6336882cacc8e05295166239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 5360 bytes
font_02_sfnt_off00013def.bin
aed1c6f2f0dbb942f27514ca71587f860ffe80b2b7bb04b954e24b034e4c19f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 10392 bytes

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